Punch ing-machine



I U ITE STATES PATENT FFIQE.

HENRY HARRISON PAOKER, 0F BOSTON, MASSACHUSETTS.

PUNCHING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 272,151, dated February 13, 1883.

' Application filed August 16,1882. (No model.)

To'all whom it may concern Be it known that I, HENRY HARRISON PACK- ER, a citizen of the United States, residing at Boston, inthe county of Sufl'olk and State of Massachusetts, have invented certain new and useful Improvements in Punching-Machines; and I do hereby declare the following to be a full, clear, and exact description of the invem tion, such as will enable others skilledin the art to which it appertains to make and use the same, reference being had to the accompanyin g drawings, and to letters or figures of refer-- ence marked thereon, which form a part of this specification.

Thisiuvention relates to punching-machines, to be operated either by a hand or foot pedal or power, as may be desired; and it consists of three principal features first, in having a movable head independent of the yoke, so called, as heretofore generally used on punching machines, this movable head carrying -the punch-holder and punch, the latter, by

meansof said holder and the movable head, being operated by mechanism hereinafter more fully described.

The second feature of my improvements 0on sists in the means for adjusting the length of the punch, according as it wears away or becomes shortened through sharpening or the work to be done, and is accomplished bypassing the upper portion of the punch holder through the top of the movable head, and having attached thereto, both above and below said upper end, two hand-nuts, the top one to raise or lower the punch-holder and punch, and

' the lower or under one to clamp said holder securely in place when its desired position is attained. 1 y

The third feature of my improvements consists in a movable joint in the middle, or approximately thereto, of the punch-holder.

By my improvements the ordinary yoke of the punching-machine, which usually takes the out of proper vertioaladjustment.

but the strain proper is imparted through the punch-holder to the top of the movable head, which, if the latter'had a tendency to spring, which generally occurs under severe strains in other machines, would throw the punch The socketed joint in the middle of the punch-holder is provided to obviate and completely nullify said spring and allow of great strain and even springing of the movable head without in'the least affecting the movement of the punchholder and punch connected thereto.

The drawings accompanying this specification represent in Figure 1 a side elevation of a punching-machine embodying my improvements, and Fig. 2 a vertical section through the punch-holder and punch. Fig.3 is a'horizontal cross-section through the punch-holder, movable head, and yoke, showing guides for the punclrholder.

In these drawings, A represents a frame or stand, to which the operative mechanism is attached and supported; B, the base or standard for the yoke D, formed in one casting and bolted to the frame A; a a, b b, c c, and d d, side and end braces for strengthening said frame. The'yoke D is of the shape usual in such yoke's, but instead of being entirely solid has a solid head or portion, 0, and two extended ribs or flanges,ff, between which the movable head E reciprocates. The front portion, 6, of the yoke D is, moreover, cast to fit the punch-holder F, and, further, provided with guide-plates gg, secured with suitable bolts to enable perfect vertical adjustment of the punch to be made.

This punch-holder F may be of any suitable size or dimensions 1n cross-section to give it proper strength.

length to receivetwo hand-adjusting nuts, H I. The screw-threaded portion t' passes freely through the extremity G of the head E, and consequently the weight of the punch-holder falls upon the hand-nut I, while H acts as a clamp-nut. Furthermore, as the latter takes the entire strain on the active stroke, I have shown it of considerable length in order to give the requisite strength on the thread to prevent the latter being stripped, and for the same purpose generally have the extremity of said nut H to bear firmly against the shoulder m in the portion G whenin proper adjustment.

To secure the two parts t j, composing the punchholder, together, I bore a hole through the ball-joint l and likewise the upper part of h, as shown, and insert therein a pin or bolt, 72. 1 also slightly out up the edges of the shoulder at 0, Fig. 2, and this, in connection with the spherical socket, gives the requisite motion sufficientto obviate any spring or yielding of the head E under severe thrusts and strains and allows the punch to play in vertical paths of movement by means of the yoke D and guides g 9, upon which no strain falls except to resist any shearing tendency the punch may have as it passes through the metal to be operated on. The movable head E is in shape a half-inverted U, looking at it from one side,

and in cross-section double T, so-called, in

order to give it great strength. This head is held in its proper position at the top by means of its connection with the punch-holder F and its guides g g. The lower portion is attached by the boltp and link or links M to one corner of a casting, N, by the bolt P, this lever being secured by a hanger, o, to the under side of the base B by the bolts, and rocking thereon when occasion requires; or the link M can be dispensed with and the movable head E made to extend to the lever N.

To the lowercorner of the rockinglever N is secured, by means of the bolt '6, one end of a knuckle or toggle joint, S, the upper part of which is pivoted to the bed B at s. This portion T of the knuckle-joint S is a long trian gular-shaped bar, rectangular in crosssection, and has connected to its extreme outer end a rod, U, which extends downward and is attached near the pivoted end of a foot-lever. Furthermore, this foot-lever X is fastened to one of the braces b, and is kept in proper position-that is, ready for an active stroke-by the rod u and counterpoise-weight V. Said rod u is pivoted to the lever X and likewise to the rod M, which latter is suspended from a rocker-shaft, '0, supported on the hangers a: w. This counterpoise-weight V is of sufficient weight and so arranged as to overcome the friction aiid gravity of the entire working parts of the machine, and to return said mechanism after an active stroke to its inactive or passive condition, ready for a second stroke.

Having thus described the mechanical details of construction of my improvements, I

will now proceed to show the movements of the parts relatively to each other, the machine being in an inactive position, but ready for an active stroke, as shown in Fig. l of the drawings. The operator placing his foot on the end of the lever X depresses it, and likewise at the same time, by means of the rod U, connected therewith, the outer extremity or nose of the upper part of the knuckle-joint S, and thereby straightens said joint, by which means the lowest corner of the bell-lever N is thrust back, swinging on the pivot s as its center. This thrusting back of the bell-lever by the intermediary connecting-link M depresses and draws down the movable head E, and with it the punch-holder F and punchj, driving said punch through the metal placed below it. p

I do not restrict myself to the precise manner, as herein shown, of obtaining the power, as said power can be obtained in divers ways, and increased or diminished by the alterations of the position of the pivots.

This machine can be used for drawing up, so called, equally as well as for punching, and can be used on very light metal without crushing, owing to its perfect freedom from lateral shearing or deviation from the vertical line of movement common in presses of the ordinary construction, unless a very heavy press is used compared with the work to be accomplished.

In ordinary presses the resistance to the punching pressure is borne by the yoke D, and in case this breaks an entire new machine mnst be substituted and considerable expense incurred; but with a movable head, as previously stated, the'yoke D is relieved from the entire strain of the work accomplished, and the casting E, in case it is broken, can readily be replaced byremoving the adjustingone.

This .machine can be readily operated by power by attaching the power tothe movable head E direct or to'the knuckle-joint S, as most convenient or desirable.

I claim- 1. A movable head and punch-holder attached thereto, .in combination with a yoke which guides said head and holder, and a counterbalance-weight, bell-crank levervN, and connecting and actuating mechanism, substantially as set forth.

2. In combination with a treadle, counterbalance-weight, knuckle-joint, and bell-crank lever N, a head and punch-holder reciprocated by the foregoing devices,'and a yoke or frame in which said head and punch holder are guided.

3. A puncheholder consisting of two parts connected by a socketed joint and having the upper'part screw threaded, in combination with a yoke-in which the lower part of said holder isguided, the head through which the upper part of said holder passes, and the screw I and pin or boltp and inserting a new III nuts H and I, applied to the threaded 'part of In testimony whereof I afiix my signature in [0 said holder above and below said head, as set presence of two witnesses. forth. I i

4. A punchholder consisting of two parts HENRY HARRISON PAGKER. 5 connected by a socketed joint, in combination with a head to which the upper part of said Witnesses: holder is attached, and a yoke in which the H.E. LODGE, lower part of said holder is guided, substan- R. F. WATSON. tialiy as set forth. 

